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import os
import shutil
import sys
from django.core.exceptions import ImproperlyConfigured
from django.db.backends.base.creation import BaseDatabaseCreation
from django.utils.encoding import force_text
from django.utils.six.moves import input
class DatabaseCreation(BaseDatabaseCreation):
@staticmethod
def is_in_memory_db(database_name):
return database_name == ':memory:' or 'mode=memory' in force_text(database_name)
def _get_test_db_name(self):
test_database_name = self.connection.settings_dict['TEST']['NAME']
can_share_in_memory_db = self.connection.features.can_share_in_memory_db
if not test_database_name:
test_database_name = ':memory:'
if can_share_in_memory_db:
if test_database_name == ':memory:':
return 'file:memorydb_%s?mode=memory&cache=shared' % self.connection.alias
elif 'mode=memory' in test_database_name:
raise ImproperlyConfigured(
"Using a shared memory database with `mode=memory` in the "
"database name is not supported in your environment, "
"use `:memory:` instead."
)
return test_database_name
def _create_test_db(self, verbosity, autoclobber, keepdb=False):
test_database_name = self._get_test_db_name()
if keepdb:
return test_database_name
if not self.is_in_memory_db(test_database_name):
# Erase the old test database
if verbosity >= 1:
print("Destroying old test database for alias %s..." % (
self._get_database_display_str(verbosity, test_database_name),
))
if os.access(test_database_name, os.F_OK):
if not autoclobber:
confirm = input(
"Type 'yes' if you would like to try deleting the test "
"database '%s', or 'no' to cancel: " % test_database_name
)
if autoclobber or confirm == 'yes':
try:
os.remove(test_database_name)
except Exception as e:
sys.stderr.write("Got an error deleting the old test database: %s\n" % e)
sys.exit(2)
else:
print("Tests cancelled.")
sys.exit(1)
return test_database_name
def get_test_db_clone_settings(self, number):
orig_settings_dict = self.connection.settings_dict
source_database_name = orig_settings_dict['NAME']
if self.is_in_memory_db(source_database_name):
return orig_settings_dict
else:
new_settings_dict = orig_settings_dict.copy()
root, ext = os.path.splitext(orig_settings_dict['NAME'])
new_settings_dict['NAME'] = '{}_{}.{}'.format(root, number, ext)
return new_settings_dict
def _clone_test_db(self, number, verbosity, keepdb=False):
source_database_name = self.connection.settings_dict['NAME']
target_database_name = self.get_test_db_clone_settings(number)['NAME']
# Forking automatically makes a copy of an in-memory database.
if not self.is_in_memory_db(source_database_name):
# Erase the old test database
if os.access(target_database_name, os.F_OK):
if keepdb:
return
if verbosity >= 1:
print("Destroying old test database for alias %s..." % (
self._get_database_display_str(verbosity, target_database_name),
))
try:
os.remove(target_database_name)
except Exception as e:
sys.stderr.write("Got an error deleting the old test database: %s\n" % e)
sys.exit(2)
try:
shutil.copy(source_database_name, target_database_name)
except Exception as e:
sys.stderr.write("Got an error cloning the test database: %s\n" % e)
sys.exit(2)
def _destroy_test_db(self, test_database_name, verbosity):
if test_database_name and not self.is_in_memory_db(test_database_name):
# Remove the SQLite database file
os.remove(test_database_name)
def test_db_signature(self):
"""
Returns a tuple that uniquely identifies a test database.
This takes into account the special cases of ":memory:" and "" for
SQLite since the databases will be distinct despite having the same
TEST NAME. See http://www.sqlite.org/inmemorydb.html
"""
test_database_name = self._get_test_db_name()
sig = [self.connection.settings_dict['NAME']]
if self.is_in_memory_db(test_database_name):
sig.append(self.connection.alias)
return tuple(sig)
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